高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (11): 1030.

• 研究简报 • 上一篇    下一篇

CaO对ZSM-5沸石选择性催化作用的影响

吴锁川1, 冯星洪2, 周日新2   

  1. 1. 南京师范大学化学系;
    2. 南京大学化学系
  • 收稿日期:1984-08-03 出版日期:1985-11-24 发布日期:1985-11-24

The Effect of CaO Modification on Selectivity of ZSM-5 Zeolite

Wu Suochuan1, Fen Xinghong2, Zhou Rixin2   

  1. 1. Department of Chemistry, Nanjing Normal University, Nanjing;
    2. Department of Chemistry, Nanjing University, Nanjing
  • Received:1984-08-03 Online:1985-11-24 Published:1985-11-24

摘要: 为了进一步闸明ZSM-5沸石的选择性催化作用,本文利用CaO对其改性,从实验和理论计算方面探讨对二甲苯选择性的变化,得到一些有意义的结果。(一)实验及结果ZSM-5沸石原粉,经HCl交换成HZSM-5沸石,再和CaO按一定比例混合在一定温度下焙烧数小时,即为改性的催化剂HZSM-5-CaO。

Abstract: The effect of CaOmodification on the selectivity of ZSM-5 was studied. The selectivity of the modified catalyst toward dimctyl benzene in the aromatzation of propenc and the methylation of tolune was increased by a factor of 2.7 and 1.6 respectively in relation to the unmodified one.The calculation based on the window model was made for the charge density of the carbon atom in tolune when on the modified and unmodified catalyst.The results show that the charge density for the para-carbon atom of tolune is largely increased in the CaOmodified ZSM-5 and the energy in I3 position is the lowest,thus favor the electrophilic reactions.This explains the improved selectivity toward dimethyl benzene of ZSM-5 upon CaOmodification.

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